export  default  {
 addCart(context,payload){
   return new Promise((resolve,reject) => {
     //查找之前数组中是否有该商品
     let oldProduct = context.state.cartList.find(item => item.iid === payload.iid)
     //判断oldProduct
     if (oldProduct){
       context.commit('addCounter',oldProduct)
       resolve('当前的商品数量+1')
     }else{ //添加了新的商品
       payload.count = 1
       context.commit('addToCart',payload)
       resolve('添加了新的商品')
     }
   })

 }
}
